Home / 1,309.12-1,972.55-1,083.08

Finding the Fourth Proportional to 1,309.12, 1,972.55 and 1,083.08

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Solution

The fourth proportional to 1,309.12, 1,972.55 and 1,083.08 is: 1,631.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,309.12 : 1,972.55 = 1,083.08 : x
  2. Step 2: Convert to fraction form
    1,309.12/1,972.55 = 1,083.08/x
  3. Step 3: Cross multiply
    1,309.12x = 1,972.55 × 1,083.08
  4. Step 4: Simplify right side
    1,309.12x = 2,136,429.45
  5. Step 5: Solve for x
    x = 2,136,429.45/1,309.12
  6. Step 6: Final answer
    x = 1,631.96

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.